Title:
Behavior of CFRP for Prestressing and Shear Reinforcements of Concrete Highway Bridges
Author(s):
Amir Z. Fam, Sami H. Rizkalla, and G. Tadros
Publication:
Structural Journal
Volume:
94
Issue:
1
Appears on pages(s):
77-86
Keywords:
carbon fibers; concretes; cracking (fracturing); prestressing steels;
DOI:
10.14359/463
Date:
1/1/1997
Abstract:
This paper describes the behavior of five I-girders, 9.3 m (30.5 ft) each, exclusively reinforced for shear and prestressing by carbon fiber reinforced plastic reinforcements (CFRP), and one beam prestressed by conventional steel strands and reinforced by steel stirrups. The test beams are 1:3.6 scale models of bridge girders to be built in Manitoba, Canada, using two types of CFRP reinforcements for shear and prestressing. To simulate the composite action of the bridge deck, the stirrups were projected from the girder into the slab, which was cast after a minimum age of 7 days of the prestressed beams. Various web reinforcement ratios were used for each type of the CFRP reinforcements. Test results were compared to the ACI building code and the modified compression field theory. Effect of CFRP stirrups configuration and size on the shear behavior and their performance in providing the dowel action between the girder and top slab are discussed. Draping effect of the prestressing CFRP tendons is also presented.